Cutting oil



Patented Dec. 3, 1946 CUTTING OIL Thaddeus Williamson Culmer, Robinson,111., as-

signor to The Ohio Oil Company, Findlay, Ohio, a corporation of Ohio NoDrawing. Application August 13, 1943, Serial No. 498,577

2 Claims.

This invention relates to'cutting oils and. more particularly to acutting oil which has been treated to prevent staining.

With present day oils which are of the type used for cutting,particularly those employing mineral blending oils having a maximumviscosity of 125 at 100 S. U., there is a tendency for the oil to stainnot only the cutting machinery but also the work. This is objectionablenot only because of the staining of equipment but also because the workpiece produced may he rejected by an inspector in view of the stain.Most cutting oils are compounded from chlorinated sulphurized bases andit would appear that during operation the sulphur breaks out of thecombination in an active form and. reacts with the metal to form a stainof various degrees of intensity.

An object of the invention is to provide a cutting oil which will notstain the work or the machinery. A further object is the addition of afatty oil or compound of the glycero phosphate type, for example,lecithin to a cutting oil compounded from a chlorinated sulphurized basesuch as sperm oil and petroleum neutral oil for the prevention of stainson the surfaces of metals with which it comes in contact.

While the amount of lecithin or other products which can be added mayvary to suit particular cases, in my preferred form T 6 to 1% issufficient. In preparing the oil 1000 pounds of lecithin and 56 gallonsof 100/100 neutral oil or sperm oil are placed in a steam jacket mixingkettle provided with paddles or other agitators. Heat up to 150 F. isapplied and as soon as the lecithin has softened sufficiently the massis agitated until the lecithin has been completely dispersed ordissolved in the oil.

This solution may then be stored and added to the cutting oil as it ismade. Approximately .35 of a gallon is added to each gallon drum ofcutting oil and rendered homogeneous therewith by agitation. Thisresults in a final cutting oil which contains approximately 0.5% oflecithin by weight.

The final product will not stain or discolor the work or the cuttingmachinery and the free sulphur is taken care of by the lecithin so'thatno sulphide coating appears on the metal.

I claim:

1. A chlorinated sulfurized sperm oil cutting oil which yields activesulfur under conditions of normal use, said cutting oil containing fromabout 0.5% to about 1.0% of lecithin to prevent such active sulfur fromcausing'stains.

2. A cutting oil compounded from chlorinated sulfurized sperm andpetroleum oils from which under conditions of normal use active sulfurbreaks out, said cutting oil containing from about 0.5% to about 1.0% oflecithin-to prevent such active sulfur from causing stains.

THADDEUS WILLIAMSON CULMER.

